| Responses of alkaline phosphatase activity in Daphnia to poor nutrition. | |
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MedLine Citation:
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PMID: 22327742 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The use of biochemical and molecular indices of nutritional stress have recently been promoted for their potential ability to assess the in situ nutritional state of zooplankton. The development and application of these indicators should at least consider the cross-reactivity with other nutritional stressors. We examined the potential usefulness of body alkaline phosphatase activity (APA) as an indicator of dietary phosphorus (P) stress in Daphnia. We measured growth rate, body P-content, and body APA of two species of Daphnia (D. magna, D. pulex) grown for different periods under diverse dietary conditions. We found P-poor food reduced daphnid growth rates and body P-content, while body APA increased in both species. However, body APA increased in P-sufficient D. magna and D. pulex that were feeding on cyanobacterial compared to green algal food, despite no differences in animal body P content. Body APA increased in D. magna fed P-poor food whether cyanobacterial or algal. Body APA also varied with age and other nutritional stresses (low food quantity, nitrogen-poor algae) in both daphnid species. Our results demonstrate that whole body homogenate APA in Daphnia is not singularly responsive to P-poor food, which will complicate or limit its future usefulness and application as an indicator of dietary P-stress in metazoans. |
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Authors:
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Nicole D Wagner; Paul C Frost |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-2-12 |
Journal Detail:
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Title: Oecologia Volume: - ISSN: 1432-1939 ISO Abbreviation: - Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-2-13 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0150372 Medline TA: Oecologia Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Environmental and Life Science Graduate Program, Trent University, Peterborough, ON, Canada, nicolegoulding@trentu.ca. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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